Drill screw and methods and apparatus for manufacturing same

Details Drill screw and methods and apparatus for manufacturing same Drill screw and methods and apparatus for manufacturing same

B - Operations, Transporting

23

B

85/107, 77/35

B23B 51/02 (2006.01) F16B 25/10 (2006.01)

Patent

CA 1082010

TO ALL WHOM IT MAY CONCERN: BE IT KNOWN THAT I, CHARLES BURTON WHITTAKER, JR., a citizen of the United States of America, residing at 1015-5 Foxcroft Lane, County of Iredell, Statesville, North Carolina, have invented certain new and useful improvements in DRILL SCREW AND METHODS AND APPARATUS FOR MANUFACTURING SAME ABSTRACT OF DISCLOSURE A drill screw comprising a threaded fastener with a drill bit formed on its entering end, the drill bit characterized by a bi-arc cross-section, that is the shape which is shared by two partially overlapping circles.

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